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@INPROCEEDINGS{Izumoto:859328,
      author       = {Izumoto, Satoshi and Huisman, Johan Alexander and
                      Zimmermann, Egon and Méheust, Yves and Gomez, Francesco and
                      Heyman, Joris and Wu, Yuxin and Vereecken, Harry and Le
                      Borgne, Tanguy},
      title        = {{S}pectral induced polarization of calcite precipitation in
                      a porous media},
      reportid     = {FZJ-2019-00197},
      year         = {2018},
      abstract     = {Induced calcite precipitation is used in a range of in-situ
                      geotechnical applications to modify the mechanical and
                      hydrological properties of soils and fractured rocks. It is
                      also a model process for mixing-induced biogeochemical
                      reactions that occur naturally in a broad range of
                      hydrological systems. Laboratory experiments have shown that
                      spectral induced polarization (SIP) measurements can be used
                      to monitor calcite precipitation. However, the results of
                      the limited number of previous studies investigating the SIP
                      response of calcite precipitation were not fully consistent.
                      This study aims to investigate how the SIP response of
                      calcite depends on solute composition, since this may
                      explain the differences in SIP response observed in previous
                      studies. For this, a five-phase experiment with SIP
                      measurements on a column filled with sand was performed. In
                      phase I, calcite precipitation was generated for a period of
                      12 days by injecting Na2CO3 and CaCl2 solutions through two
                      different ports. This resulted in a well-defined calcite
                      precipitation front, which was associated with an increase
                      in the imaginary conductivity in the kHz frequency range. In
                      phase II, the injected solutions were stepwise diluted. This
                      resulted in a clear decrease in the imaginary conductivity.
                      In phase III, the injection of the two solutions was
                      stopped. Nevertheless, calcite precipitation continued and
                      solute concentrations in the mixing zone decreased. As in
                      phase II, this led to a decrease in the imaginary
                      conductivity. In phase IV, the injection rate of the Na2CO3
                      solution was reduced to shift the mixing zone away from the
                      calcite precipitation front, which also decreased the
                      imaginary conductivity. Finally, the column was flushed with
                      a solution in equilibrium with calcite in phase V, which led
                      to a very small SIP signal. These results imply that the SIP
                      response of calcite is very sensitive to the solution
                      composition near the precipitates, which may explain the
                      previously reported conflicting results. In a next step, the
                      relationship between SIP response, volume of calcite, and
                      solute composition will be quantitatively investigated using
                      SIP measurements on a 2D milifluidic cell with an artificial
                      porous media that allows visualizing the temporal dynamics
                      of calcite precipitation.},
      month         = {Dec},
      date          = {2018-12-10},
      organization  = {AGU Fall Meeting, Washington, D.C.
                       (USA), 10 Dec 2018 - 14 Dec 2018},
      subtyp        = {After Call},
      cin          = {IBG-3 / ZEA-2},
      cid          = {I:(DE-Juel1)IBG-3-20101118 / I:(DE-Juel1)ZEA-2-20090406},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255) / ENIGMA - European training Network for In situ
                      imaGing of dynaMic processes in heterogeneous subsurfAce
                      environments (722028)},
      pid          = {G:(DE-HGF)POF3-255 / G:(EU-Grant)722028},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/859328},
}